After a group of biologists discovers a huge network of unexplored caves in Romania and, believing it to be an undisturbed eco-system that has produced a new species, they hire the best American team of underwater cave explorers in the world. While exploring deeper into the underwater caves, a rockslide blocks their exit, and they soon discover a larger carnivorous creature has added them to its food chain.
Out of enthusiasm, a Militia soldier abandons his platoon and decides to fight for the cause of the Revolution. His Lieutenant and the rest of the crew look for him during the confused night of 22-23 December 1989.
